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Method for production of stamped sheet metal panels

a technology of sheet metal panels and stamping, which is applied in the direction of metal-working equipment, manufacturing tools, shaping tools, etc., can solve the problems of not being necessary or desirable to anneal the entire preform sheet, and achieve the effect of quick product shape, reduced heat treatment equipment size and reduced time required

Active Publication Date: 2007-08-28
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables the production of complex aluminum sheet metal parts in a single operation, maintaining material properties and reducing manufacturing costs by achieving the desired shape without excessive thinning or marring, with each step completed within a few seconds.

Problems solved by technology

It may not be necessary or desirable to anneal the entire preform sheet.

Method used

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  • Method for production of stamped sheet metal panels
  • Method for production of stamped sheet metal panels
  • Method for production of stamped sheet metal panels

Examples

Experimental program
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Embodiment Construction

[0018]Automotive vehicle body panels such as hoods have been stamped using commercial aluminum alloy sheet materials such as Aluminum Association alloys (AA) 5182 and 5754. AA 5182 has a nominal composition, by weight, of 4.50% magnesium, 0.35% manganese 0.20% silicon, 0.15% copper, 0.10% chromium, 0.25% zinc and the balance substantially aluminum. AA5754 has a nominal composition, by weight, of 2.7% magnesium, 0.80% manganese, 0.12% chromium and the balance substantially aluminum. These materials are cast, hot rolled and cold rolled to a desired sheet thickness, typically 1 to 2.5 mm, and annealed or tempered to recrystallize the work strained microstructure so that the coiled sheet material is in the most formable state (O temper condition) obtainable from the alloy composition.

[0019]Generally, aluminum sheet alloys are not as formable as available low carbon steel sheet alloys. Designers of automobiles now seek body panel surfaces and configurations with relatively deep pockets a...

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Abstract

Sheet metal parts having significantly strained portions, such as aluminum alloy body panels, can be formed by a sequence of steps comprising preform shape stamping, preform annealing and final shape stamping. The shape of the desired part is analyzed to identify portions of the geometry that cannot be formed in a single stamping step without exceeding the straining limit of the metal. A preform shape is determined in which a substantial amount of strain is stamped without tearing and the preform is annealed to re-soften the strained areas and a final stamping step completes development of the final part shape.

Description

TECHNICAL FIELD[0001]This invention pertains to high deformation stamping of sheets of work hardenable aluminum alloys. More specifically this invention pertains to a process for the rapid production of one piece stamped aluminum sheet panels that cannot be formed in a single stamping operation without damaging the part.BACKGROUND OF THE INVENTION[0002]Automotive body panels and sheet metal products have been made of suitable steel alloys by stamping processes at ambient temperatures. The edges of a steel sheet blank are gripped by a binder mechanism and a punch pushes and draws the metal against a generally concave forming surface. Often a steel alloy is available that is suitably formable and the metal is stretched into a complex shape such as a body panel without tearing, wrinkling or otherwise marring the sheet. A progressive sequence of stamping and, for example, piercing and trimming operations may be successively performed on a single steel sheet to make a panel with each ste...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B21D31/00B21D37/16B21J1/06
CPCB21D22/022
Inventor KRAJEWSKI, PAUL E.
Owner GM GLOBAL TECH OPERATIONS LLC
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